Used to refer to a dumbass or dummy.
"Jessica is such a duzzie. She's always dating assholes and then whining about it when they break her heart."
Used to refer to a large bottom. ("phat" meaning large and "bat" short for the British slang term "batty" which refers to the buttocks).
"Damn, that girl has a phatbat!"
"I know, right!? If it was any phatter, her jeans would tear right off."
"A guy can dream..."